reindent-after-perl-yank: preference variable

Default value: 0

When you yank text into a buffer in Perl mode, Epsilon automatically
reindents it. This is similar to the "smart paste" feature in some
other editors. Epsilon won't automatically reindent very large blocks
of text. This variable specifies the size in characters of the largest
block that should automatically be reindented. Set it to 0 to
disable automatic reindent in Perl mode, or -1 to reindent all
text yanked in Perl mode.